A:有纺锤丝的出现
B:有染色体复制和染色体的平均分配
C:有染色体出现
D:有核膜、核仁的消失
They needed more soldiers to ____ (保卫) the country border.
写出偏旁是灬的三个字。____、____、____
This green bag is ____(轻的).